Yellow vat dye.



UNITED STATES PATENT OFFICE.

HERMANN FRIEDMANN, 0F ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VOBM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GER- Patented Aug. 6, 1912.

MANY.

YELLOW VAT DYE.

1,034,896. Specification of Letters Patent.

No Drawing.

To all whom it may concern:

Be it known that I, HERMANN FRIEDMANN, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Yellow Vat Dye, of which the following is a specification.

The present application concerns the manufacture and production of new vat dyes of the anthracene series having most probably the formula:

(R meaning a substituent such a methyl, ethyl, phenyl, tolyl, Xylyl chlorophenyl, methoxy-phenyl and R meaning an 'acyl such as benzoyl, acetyl, methoxybenzoyl).

The new dyes can be obtained by acylizing the dyestuli's described in my application Serial No. 664,858 filed the same date by means of acylizing agents such as acetyl chlorid, benzoyl chlorid, methoxybenzoyl chlorid. They are after being dried and pulverized yellow to orange powders soluble in pyridin and in concentrated sulfuric acid with a yellow coloration, yielding vats with hydrosulfite and caustic soda lye which vats dye cotton generally yellow shades.

In order to illustrate the new process more fully the following example is given, the parts being by weight :-To a solution of 1 part of the product obtained by combination of 1-oxy-2.4-diaminoanthraquinone with benzaldehyde in 10 parts of nitrobenzene, 1 part of benzoyl chlorid is added and the mixture is heated to 150 C. When the reaction is finished the mixture is cooled and the separated dyestult which is the 4-ben- Zovlamino u-phenyl-l.Q-anthraquinone-oxa- Z0 is filtered off and dried. The new vat dyestutt crystallizes in yellow needles from nitrobenzene which are soluble in concentrated sulfuric acid with a yellow coloration and yield a red vat with hydrosulfite and Application filed December 9, 1911. Serial No. 664,857.

NaOH from which cotton is dyed in a yellow shade distinguished by its fastness to llght, washing and ironing. The new dyestutf thus obtained has probably the for- 1. The herein described new vat dyestufi's having most probably the formula:

pica/Kl R meaning an aryl substituent and R meaning acidyl, which are yellow to orange powders soluble in concentrated sulfuric acid with a yellow color; yielding vats, which dye cotton yellow shades, on saponification they furnish the intermediate products from which they were produced by acetylization, substantially as described.

3. The herein described new Vat dyestufi's having most probably the formula:

l L i l V 10 11-0 which may be obtained in yellow needles dissolving with a yellow coloration in concentrated sulfuric acid, yielding a vat with hydrosulfite and caustic soda lye which dyes 15 cot-ton in a yellow shade distinguished by its fastness to li ht, washing and ironing, substantially as eseribed.

In testimony whereof I have hereunto set my hand in the presence of two subscribing 20 witnesses.

HERMANN FRIEDMANN. 1,. 8.

Witnesses HELEN NUFER, A. NUFER.

Copies of this patent may be obtained for five cents each, by addressing the-Commissioner of Patents, Washington, D. 0. 

